Aircraft pilot&#39;s seat



A. a. ROGERS ET AL,

AIRCRAFT PILOTs SEAT jan. 16, 1951 5 Sheets-Sheet l 3?@ faz INVENTORS fi lf' www WJ w A Jan, i6, 195i A. B. ROGERS ET AL.

AIRCRAFT PILOTS SEAT 5 Sheets-Sheet 2 Filed Aug. 29, 1944 jan. 16, WSE

Filed Aug. 29, 1944 A. B. ROGERS ET AL AIRCRAFT PILOTS SEAT 3Sheets-Sheet 5 Patented Jan. 16, 1951 i omiso STATES PATENT oFF-ICEAIRCRAFT riiiofrssliAfry Y Allaah., lingers l and Charles;-

Browp., Sento lvlonic'a,y Q alii., assignors to Douglas AircraftCompany, 1.110.-, vooipovation. of California Application August 29,19441, Serial No. 551,652

14 claims., 01. 24a-1,22)

The present invention relates to seatsv and' more` particularly toimprovements in adjustaloll andreadily removable aircraft pilots seats.

It is already known to provideA a seatA for a pilot. or other occupantwhich is adjustable vertically and whichA is also resiliently supportedat any of-its .vertically adjusted positions. The pres.-l ent inventionrelates.A toI improvements; in this general type seat and moreparticularly to a mounting arrangementwhereby such seats are permittedto be moved` laterally to. facilitate the.. pilots` entry and egress, asWell as. to permitY the ready removability yof the seat. Many of the.priorA seats, and seat arrangements which have beenY either proposed orused have proven objecmeans and latches, and were not otherwise fool:

prooi in presenting projecting parts, which might be accidentally`caught by the pilotsv clothing O1 equipment. The present invention hasovercome these and other objectionsto the prior art; devices andprovides a novel seat mounting arrangement by means of which the` seatis. adjusted or moved laterally, as well asY vertically, to permit,ready entry and egressL of the occupant and is further arrangedthat itis. readily removable from its supporting structure. y A problemconfronting aircraft desgrlrs has been the provision of a pilot positionhaving rela,- tively great v sibiiity in the nose portions of air: craftfuselages .of generally .Circular cross-section to withstand internalpressurizatiop- V"I llis prob..-v lem has been successfully overcome bythe proyision of openings in the Vfuselage wall` above`v the pilotsseat; and the provision of outwardly bulged transparent enclosures.commonly referred to as oblig-eyes orblisters. disposed above eaoliopone ing. The present: invention is particularly adepted. for withpilot enclosures of the type olescribed in cci-pending application.Serial No.. 459.212. Wbioh issued ou September 25.. lilfia as lia-tent,Ztpl for a Pilot Enclosure, to Eolward Burton and Allan. B.. Rogers.the. latter being one of .tbe applicants ,in the present applioationlItis'aooordipgly a primary .object of the'proSf ent invention to provide aseat mounting ar.- lrangement by means of which a vertically adjustableresiliently supported seat may be mounted upon a supporting structure,to` permit of its 'being laterally movable to` readily permit entry andegress of the occupant. 'Itis :a fur..-

2. ther object to provide an arrangement ofV pilots and co-pilots. seatswithin an airplane pilots Compartment which more comfortably facilitatesthe. entry and egress of the pilots into and out oitheir operativepositions.

It is also an object ,of the present invention to provide` a seatarrangement such that the pilot may readily yslide the seat sidewayswhen getting intoV or out of the seat yet lock it securely in itsoperative position Without the necessity oi having any projecting leversor the like to be operatedY and .which might be accidentally Caught bythe pilots clothing or equipment. A further` object of; the presentinvention residesA in the provision of a novel seat suspension in whichthe seat lstructure may'be readily removed by releasing the Connectionto. the ySeat positioning struetu but in which the. seat remainssuspended l 1; lifted off;- the. Supporting structure thereby .ding thepossibility of accidental damage to -qupmept in the pilots Compartment.

Qthorf objects ,and advantages of the present invention will. becomeapparent to those Skilled the art. after a reading. of the presentdescription' togetherwith. .the oooompanying drawings for 'pg aparthereof, in which:

vlie-'1 l. is top plop View ol 'the pilotis compartroept-of airplaneequipped with the seat and `Seatingorrongemeot of tloe presentinvention;

,Elig- 2 is o. Side elevational View of the same ;1 Eig? 3 isaperspective View showing one ofthe ooo its, Supporting structure: Eig.4y is aV cross sectional view of one of the main supporting tubebrackets as taken up along the line 4/ 4 of Fig,.- 5; Y

Eig. 5 is a rear elevational view of the bracket of Eig. 4 together withthe adjacent latching oorrioge fitting;

Fig. 6 is an end elevational vievv ofthe main supportingl bracketshowni-n Figs. 4 and 5;

Fig. 7 is a top plan view of the bracket shown in Eig. 6 as indicated bythe line '1 -.l and also includes the adjacent carriage tting;

Fig. 8 is a side elevational view of the same carriage litting shown inFigs. 5 and 7;

Fig. 9 is a rear elevational view of the complementary supportingbracket and its releasable tube attachment; f

Fig. 10 is a rear elevational view of one of the Y11101961? rollerattachment ttings;

Fig.` 1v1 is a plan view of the same; and

Fig. lf2 is a side elevational view of the other roller attachmentfitting.

Referring now. to Figs. 1 and 2, the numeral iB. represents the.fuselage. of a relatively large .these iittings.

I8. The numeral I9 indicates a control pedestal of a size frequentlyfound necessary in large aircraft of the type shown, and forwardlythereof, and of the control columns, theregis 'provided the conventionalinstrument or control panel 25 on which the instruments and furthercontrols are mounted.

The main upper floor or deck of the aircraft aft of the bulkhead l3|i isindicated at 2I at an elevation appreciably lower than that of thecompartment floor I2; and centrally disposed' within the airplane in alateral sense and extending into the plots compartment ati an-intermediate elevation is the step or landing 22. This step 22 extendslaterally between the opposed end channel uprights I3I and MI ofthebulkheads I3 and I4, aft to the riser 2Ia at the bulkhead line, andterminates forwardly at the riser 22a.. Immediately above the pilots andco-pilots seats I 6 and I5, there are provided openings through thestreamlined skin of vthe fuselage, and each of these openings is fairedand protected by an individual transparent bubble or bug-eye. Each ofthese streamlined bug-eyes or blisters is preferably made of a singlepiece of transparent glass or plastic, being of a rounded'form forwardlyand tapering substantially tol a point at its aft extremity. The pilctscompartment is accordingly devoid of a windshield or cockpit canopy ofthe conventional type, but is provided with two individual bubblelfairings adapted to shield and protect the Apilots head, which in hisoperating position, extends outwardly beyond the projected line of theexterior surface of the'fuselage skin.

Referring now to Fig. 3, there is shown a more or less conventional seati6',` whichris the pilots seat of Fig.. 1, andrwhich is supplied withall the usualttings cooperating with the pilots standard and combatequipment. This seat is alsoprovided with conventional equipment for itsadjustment for height and ,its resilient support at the adjusted height,and which features will be hereinafter more fully referred to. To thevertical bulkhead channels I 4l and I 42, there is fixedly attached thehorizontal channels or interstices |43 and 44. A rigid chair supportingframe is formed by the vertical tubes 24 and 2S connected adjacent theirupper terminals to the upper cross tube 28 and adjacent their lowerterminals to the lower cross tube 39. A main weight supporting 'andsecuring tube 32 is releasably supported within the;l bracket ttings 34and 35 which` in turn are attached to'the'upright channels I'42 and I4Irespectively just above the pilot compartment iioor I2. The ttings orcastings 38 and 4? serve to connect the'vertical tubes and 2 5 withA thelower cross tube 30 and also to'transmit the weight of the chair I6-andits voccupant to the mainisupporting tube 32 by means of the 'flangedrollers 42 and 44 pivotally mounted in each or" The frame tubes 24, 26,23 and 33 together with their'interconnecting fittings` and the rollers42'and 44 serve to form Va laterally movable supporting carriage for thechair I, substantially all of the weight being carried upon theremovable transverse tube 32.

In the constructonillustrated in Fig..3 the handle 52 attached to itsfree end, beyond the' right hand fitting 43 abuts and is detachably'locked to the right hand bracket 3B mounted upon the channel I4! in theoperative or occupied position of the chair i6, this detachable lockingbeing effected by a sp ing-pressed pin 45 housed in the projection 45 onthe bracket 35 and engaging with the openingV 4I provided in the tting40. As shown in this and VtheV detailed Figures 4 and' 5, the pin 45housed within the projection 46 is continually urged downwardly into itslatching position as indicated by the dotted lines in Fig.

4. Thus it not only extends through the opening in the tongue i i of thetting 49, but also into the notch 32h cut through the wall of theremovable tube 32 to thereby prevent its rotation by the bracket 36. Thepin 45 is released by pulling on the cable 43 which is anchored at itsupper terminal 49 to the bulkhead structure. By pulling on the cable 48the chair may be free to per-I mit it to Yslide laterally tothe leitalong the supporting tube 32 as permitted by the length of this tubeuntil the left hand roller fitting 38 is stoppedi by coming against theleft hand bracket 34I An intermediate bracket 50 for the tube 32 may beprovidedto support the tube from the compart#` ment floor I2 at a pointb-etween the brackets 34- and at which it Willnot Yinterfere with thelateral sliding 'of the roller ttings 33V and 4B.

The tubular interconnecting ttings 56 and 58 at thetop of the supportingframe have mounted in each for vertical pivotation the rollers 52 and 54which are guided laterally bythe upwardly facing channel 35 forming aVgudewayV or track. As may be more clearly seen in Figs. 10, 11v and l2,theseupperi'lttings are provided with socket portions to receive thetubes 24, 25 and28 and have axles or pivots 53 on which the'rollers 52"and 54 are. adapted to rotate. These rollers 52 and54 extend down intoand rotate along'the channel track 65 toV prevent the frame fromrotating forwardly about the rollers 42 Vand 4:1 engagingY tube or rail32, whereas substantially al1 of the Weight of the seat andits'occupants isV carried upon the supporting Vtube 32. The latter'vtube 32 'is Yar-t ranged to be readily removable from the brackets 34and 35V as'byv upward pull on Vthe cable 43 re-i leasing theV pin fromits engagement with the tubular notch 32h, being further accomplished byrotation of the handle 62 fixedly attached to the end of the tube`32Ynearest the well'o'r step 22. The opposite end of the supporting tube32 is provided with a bayonet joint comprising'af'pair of spirallyarranged slots 32s opento the end of the tube adapted -to engagethecross pin 34p iixedly supported in the'bracket fitting 34. Acompression spring'35'is attached to the bracket 34 in a position inwhich it is engaged and compressed by the tube 32, and as the tube isrotatedand the pin 34p brought toV its end the spring @serves to pushthe tube Atoward its released 1 position in which it can be pulledVlaterally until it is entire- Y ly removed from the fittings 3s, 50and35. It will'be noted Y that the upper end 'of the chair supportingVframe is guided only in its operative p'o- Asition by the rollers 52and 54 engaging the track 30 to Yprevent rotation of the Vseat on thetube32 but when this supporting tube `32 is removed Yhe supporingfra-meis suspended and entirely supported by the rollers 52 and 54.

The seat i6 is further provided with a rubber suspension `member 64 forresiliently suspending the seat from the upper cross tube 23 to which itis attached Vby the shackle 65 and in turn connected by Ymeans Yof asimilar shackle at the tasas-arfrlower moss rubata; frasi-aua runnersecuring frame-Work. The seat isfalso fprovidedswth ,a shoulder harnesscom'i'ected toa ,of telescopic .adjustment tubes 'SH Aa ispring.(noteshown) l being arranged between' the inner and thecuter tubes`tending to Akeep :the .tubes Vnested lwithin one another, :but-whichmaybe released .by the pilot pulling :upon the .cord '.12 shown anchored to.the iside. of the seat atvthe .ittingrzl .beneath the armrestl.Whilethe catchM .is releasedin this manner `by the pilot heran pull :theinner tube up 4by bending hisfbody forward (or Ivenable the inner tubefto ymove :further `into :the Aouter tube by bending his body backwardlythe rerlease of the cord 12 serving to again lock the 14. The numerali6. represents a cross .tube mounted 4for rotational .movement in thebrackets 68 referred to above and is operated .through -aflever and cordv"lll -extending'along the opposite or rig-ht hand edge of the `seat--to vthat just` refer-red to. The lattercord 111 ris. used by the pilotfor -reIeaSingthe latch -v.thereb-IS permitting lthe chair to `beadjustedlin height on the .guide columns L24 and 226; and release of thecord causes the ylatches to hold the chair in its adjusted verticalposition. "Phe .resilient telescopic suspension tube lil, referred toabove yconnected to `the harness "l by -rneans of `the attachment:buckle 15, is disposed `witliin aguide slot ifn the frame Y82?, whichis alsopro-vided with the Vguide brackets 80 which embrace and slidealong-'fthe guide Acolumns 24 and 25 adjacent their upper terminals fwhen the seat is adjusted vertically.r

By means of lthe disclosed seat suspension and seat arrangement, it ispossible for -the occupants to conveniently and quickly enter or leavetheir flight or operating positions. It should `be noted that there isnot lsuiiicient -head or foot room for either the pilot orco-pilot tostand-up upon either lthe access stepV 2.2 or the compartment iioor lf2in a position' in which he could readily -be seated upon either of theseats in 'their full line positions in Fig. l. In order to enter theseat -I5,the co-pilot rst causes the seat to be released for lateralmovement andv moves the same outwardly into the dotted Yline position atAr With the seat -in this outwardly displaced position it -isl nowpossible -for thefpilot to sta-nd up upon the access ste-p Y22 and ontothe compartment floor l2 and with his head projecting into the bug-eyeor blister through the open-ing in the -fuselage skin-surface. Thenafter seating himself upon the -displaced seat 'he .causes .the same tobe moved later-ally and inwardlyto its extreme innerv position inwhichthe vfittings' 3B and 40'come into contact with each other and thespring-pressed pin '45 engages the oriiiced tongue 4| and at the sametime locksl the tube 32 from rotation or removal by rengaging the notch32h. As the chair isthus moved laterally and in.- wardly theco-pilotshead will naturally -be raised slightly-until it 4occupies thecentralizedl or opti.- mum position within the bug-eye, or should it befound that lthe .pilots'eyes .are .either too :high or too low thechairis adjusted accordingly 'by the height adjusting .and lockingelements re.-

ierred to above.

The `entire seating'installation is arranged such that the pilots'andcol-pilots heads are definitely It should also :fbemoted thatztliere is-fnotsuiiicient h'ead'room for the pilot or corpilot tol stand up until`.theitchairs areidisplacedjlaterally l to venable the..occupantst0zstepdown to the iioor .of the accessspace 22.v The'fseats are larranged suchthat when theyvare i-n .their :inwardly vdisposed positions shown -in:the full'lnes in Fig. -1, they aezcentralflyiocated'with respect to theaxes of the zhlisters .or rthug-eyes vand .the seats have no fore andait adjustment `inasmuch as the pilots have to 'be positionedsubstantially at a denite position` within the blister. In a similar`manner lche seats may be left by either occupant by moving the seatoutwardly into its dotted line posi.- tion "with..tl'1e1`occupantzkeeping `his 'head su-bstantially -alongfthe fore Vandaft center line`of the fblister, :althoughzhis head will .of course be lowered slightly.due to the inclined attitude of the'y upper part of A:his body. VInthis outwardly moyedipositionof thesseat the occupant canreadily .-s-tepout and down uponeither or both the compartment iloor' t2 and the accessspace or stepZil.k

"It .willbe notedtha-,t among the advantages of this arrangement .of theseats is the fact that the pilot may Vreadily slide the seat sideways ingetting into or out Yof the seat and to lock it securely in itsoperativeposition Without having any levers or `.the -like vto operate -whichmight be accidentallyv caught by the vpilots clothing .or equipment. Itshould -ffuitther k,be noted that the entire sea-t may also be readilyremoved by releasing the connections to theseat positioning structure,but that Vit remains suspended until flifted down, thus avoiding thepossibility `of accidentaldamage to anyfoff-the equipnfient withinthe-pilots compartment'.

Other forms and mod ications ofthe Vpresent invention both in respect toits general arrangement and the details of its respective parts are allintended to -fall within the scope and spirit ofthis invention as moreparticularly Set forth in :the ,appended claims.

We claim:

'1. In ,a readily removable adjustable seat in.- stallation, a seathaving a back, a supporting structure, readily detachable seatsupporting l means comprising upper and' lower pairs of rotatableAelements, `horizontal guide means carried by said .supporting structureengageafble :by said upper pair of Vsaid Arotatable elements adjacentthe topof'said seat back, removable guide means releasagbly attached tosaid supporti-ng structure engageable said lower pair .of rotatableelements, Vsaid lowerv pair of Yrotatable elements adapted to'normallycarry the weight of said vseat and its occupant, said seat supportingmeans including apertured lower fittings within which said lowerrotatable elements areV utourna-led, the aperturedv portions of saidlower tti-ngs adapted to slidingly "embrace ksaid removable lower guidemeans, said upper .pair of rotatable elements normally preventingrotation of said seat about said lower pair of rotatable elements,whereby removal oflsa'd lower guide vmeans and disengagement of said`lower pair of rotatable elements and lower fittings, therefrom causessuspension of said seat from said' upper pair of rotatable elements fromwhich said seat may be readily lifted for removal from said Vsupportingstructure.

'2. 4In .a readily removable aircraft seat installation', track engagingmeansassociated' with an upperv portion of .the back of said seat, arelatively iixed track hav-ing an upwardly facing recess positionedwithin .the-transparent plasticblisters; 1.7.5 engageable ity-:said'upper engaging' means,Y yaper- 7. tured track'engagingy meansassociateddwith a lower portion of said seat back, a removable trackVmember embracingly engageable by the apertures of said lower trackengaging means', Ysaid trackengaging means including a pairv of verticalrail members, apertured means carried'bysaid seat back for verticalsliding adjustment with respect to said rail members, said lower tracknormally sustaining substantially the entire weight of said seat andsaid upper track normally serving only to maintain said seat in itsupright position, whereby removal of said lower track` member transfersthe weight of said seat to said upper track engaging-means fromwhichsaid seatand its associated rail members and.. track-'engagingwardly fromtheir operative positions to permit entry and egress of theoccupant, and means carried upon said seat slidingly mounted upon saidsuspension means for the vertical adjustment of said pilot position intothe optimum eye position of said transparent blisters.

4. In an aircraft pilot position, an exterior wall portion of anaircraft having an observation opening therein adapted for the partialprotrusion of the pilots body therethrough, a pilot'seat normallysupported l beneath said observation opening, means for laterally movingsaid seat whereby the pilot may place his body in a leaning positionbeneath said opening with his-body partially protruding therethrough anddraw'the seat laterally beneath him', and means for vertically adjustingsaid seat for his support in the normal flying position.

5. In an aircraft pilot "compartment an aircraf r skin having an openingtherein adapted to accommodate the upper portion of a pilots body forobservation therethrough, a control instrumentality disposed insubstantially the same vertical longitudinally extending plane passingthorugh the central portionrof Said skin opening, a streamlinedtransparent blister disposed around and outside the said skin openingfor the protection of therupper portion of the pilots body, a laterallymovable pilots seat adapted to facilitate the entry of a pilot into anoperative position with respect to said seat, control instrumentalityand observation opening and means for vertically ad- 8" said seat in avertical direction upon'the aircraft' structure to facilitate.positioning the pilots eyes in an optimum position withinsaid openingand enclosure, and ymeans associated with the said lateral adjustmentmeans for releasing said seat from said supporting aircraft structure.

7. In an aircraft seat arrangement, a fuselage having a pilotcompartment in a forward portion thereof, openings in the fuselage wallabove said compartment to each side of and laterally spaced from thelongitudinal vertical plane of symmetry of said fuselage, an outwardlybulged enclosure over each opening, a pilot seat normally disposedbeneath each said opening, and suspension means for said seats arrangedfor their lateral and vertical adjustment, to permit entry by the pilotand movement to properly elevated positions vwith respect to saidopenings andenclosures.

f8. A mounting for an adjustable aircraft seat comprising a fixedsupporting structure carrying upper and lower horizontal rails'disposedin a substantially vertical relationship to each other, the upper saidrailhavingan upwardly facing recess and the lower said rail beingremovable from said fixed supportingV structure, a suspensionframeworkinclu-ding a pair of vertical rail elements, means associatedwith said framework for the rolling engagement of said framework withsaid horizontal rails, said rolling means including apertured lowerportions normally engaged -by said iower rail, guide means associatedwith said seat back for sliding vertical engagement with the verticalrails of said-suspension framework, said seat adapted to be adjustedverticallyV along the vertical rails of said framework, to be adjustedlaterally a'iongrsaid horizontal rails, and to be readily removed fromsaid fixed supporting structure by removal of said lower horizontal railand the release of said suspension framework from said supportingstructure by the lifting of said r ments arranged for lateral movementof said Vmember upon said'support rails, said support justing said seatto the optimum eye position Vof said pilot with respect to saidobservation opening. Y

6. In an aircraft pilot position, la fuselage wall having an openingthrough an upper portionV member including vertical rail means, andmeans carried by said seat for engagement with said vertical'rail -meansof said support member, the seat mounting being arranged in such Ymannerthatsaid seat is laterally adjustable along said laterally extendingsupport rails to facilitate access by the occupant into the seat andwith re-" spect to said yobservation opening and'said seat is verticallyadjustable along'said vertical'rail means of said movable support memberfor the optimum head position of said occupantk with respect to saidobservation opening.V

10. In an aircraft observation position, agwall f portion ofthe aircrafthaving an observation opening'arranged for the accommodation of anoccupants head therein, an adjustable seat supported from the aircraftstructure beneath'said observation opening, a pair of vertically spacedhorizontal guides supported .upon the-aircraft structure adjacent saidseat, a suspension framework having portions arranged for engagementwith said horizontal lsupporting guides arranged for the lateraladjustment of; said suspension framework along VsaidA horizontalsupporting 9, guides, a lower of said horizontal` guides being removablefrom the aircraft structure and from engagement by the engaging portionsof said suspension framework, said seat having means engaging saidsuspension framework for vertical adjustment with respect theretowhereby the occupants accessibility into said seat and into saidobservation position is facilitated and the removability of said seatimproved by its suspension from said upper horizontal supporting guideupon being freed from engagement by said lower guide.

11. In an aircraft seat arrangement, a fuselage having an observationposition therein, an opening in the fuselage structure above saidobservation position, an outwardly bulged transparent enclosure oversaid fuselage opening, a seat normally disposed beneath Said fuselageopening, suspension means ,for said seat arranged for lateral movementthereof to permit entry by an occupant and vertical movement to properlyelevated positions with respect to said opening and enclosure, and meansassociated with the suspension means for said lateral movement forreleasing said seat and said suspension means from said supportingfuselage structure.

12. A mounting for an adjustable seat comprising a seat, a fixedsupporting structure carrying upper and lower horizontal guide meansvertically spaced with respect to each other, releasingmeans associatedwith the lower of the said horizontal guide means to facilitate itsbeing readily removable from said fixed supporting structure, asuspension member having means associated therewith for lateralsupporting movement of, said member upon said horizontal guide means,vertical guide means associated with said suspension member and saidseat for sliding vertical engagement of said seat with said verticalguide means of said suspension member, said seat arranged for verticaland lateral adjustment and for suspension from said upper horizontalguide means for removal of said lower removable horizontal guide meansduring the removal of said seat by which said seat may be lifted fromsaid upper guide means without damage to other equipment within theaircraft.

13. In an aircraft seat arrangement, a fuselage having a compartment ina forward portion thereof, openings in the fuselage wall above saidcompartment each laterally disposed with respect to the other opening,transp-arent enclosures associated with each said opening, a seatnormally disposed beneath each said opening, a floor within saidcompartment having a lowered floor portion eentraily disposed betweensaid seats, and suspension means for said seats arranged for theirlateral and vertical adjustments to permit entry by an occupant bystepping from said lowered floor portion to said man floor portion foraccess to and lateral adjustment of said seats to positions beneath saidopenings and by vertical adjustments of said seats to properly elevatedpo- Sitions with respect to said openings.

14. In a seat mounting, a seat having rail engaging means /on the backthereof, a pair of horizontal rails mounted upon a supporting structure,a lower of said horizontal rails being readily removable from saidstructure, a seat suspension member having vertical means engageablewith said horizontal rails for lateral adjustment therealong, said seatsuspension means arranged to be suspended from the upper of saidhorizontal rails upon removal of said lower readilyremovable horizontalrail, means for latching said seat suspension means with respect to saidhorizontal rails, said rail engaging means associated with said seatarranged to engage said vertical rail means of said seat suspensionmeans for vertical adjustment therealong, means to latch said seat withrespect to said vertical suspension means, said mounting arranged toprovide lateral and vertical adjustments of said seats with respect tothe(v supporting structure and suspension and ready removabilitytherefrom upon removal of said lower horizontal rail.

ALLAN B. ROGERS. CHARLES G. BROWN.

REFERENCES CITED `The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Switzerland Feb. 16, 1935

